What type of glass cracking indicates remoteness from the point of origin?

The presence of large crazing in glass indicates remoteness from the point of origin of a fire or heat source. Crazing refers to a network of fine cracks that cover a surface but do not typically penetrate deeply into the material. When glass experiences high heat, it can develop various cracking patterns, and the size and complexity of these patterns can provide clues about how far the glass was from the initial heat source.

Large crazing patterns suggest that the heat affected the glass more broadly rather than in a localized manner. This can happen when the glass is exposed to flames or heat for an extended period, allowing for a more dispersed distribution of thermal stress and cracking. In contrast, smaller fractures or localized cracking often indicate proximity to the source of the heat, as the glass may not have endured the same level of sustained thermal exposure.

Therefore, analyzing the glass and finding large crazing gives investigators important insights into the dynamics of the fire, helping to establish the point of origin and understand the fire's development and spread.